D3 Smart Key Box Metal case, zinc-alloy material, anti-vandal Waterproof, conforms to IP53 Multiple access mode: mobile APP, Fingerprint, Mifare card, PIN PIN length: 6 digits, support 16 digits User Capacity: 10 fingerprints, 150 PIN Read 13.56MHz Mifare card Micro USB port for emergency power charging Anti-peeping Password for hiding the real password Work with Tuya APP or TTLock APP (Optional) Support working with Gateway for remotely unlock Working environment: -25 55C